PhotoDNA technology computes hash value of images, videos and audio clips to identify similar images and is primarily used in prevention of child pornography by computing unique hash that represents the image.

Indonesia has blocked more than 70,000 websites displaying "negative" content such as pornography or extremist ideology in the first month of using a new system to help purge the internet of harmful material, the communications minister told Reuters.

China claims though that last year it received as many as 121,000 reports of undesirable online content from the public. Thereafter, it says more than 900 criminal cases were investigated, with 1,900 people receiving criminal penalties.

Supreme Court has issued an interim order directing the government to check online video tapes of sexual violence and child porno, cyber security experts indicated that such material were still available online and it was not easy to remove these in one go.

Ransomware eclipsed most other forms of cybercrime as on-line crime surged in 2017, European policing agency Europol said on Wednesday, citing high-profile attacks such as "WannaCry" that reached millions of computers.

Some of the techniques being used to crack child porn rings and identify victims include technology to decode encrypted files and data scrapping, which can pull information off the internet on traffickers.

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